PATCHING AND UPGRADING 10.2.0.1 RAC Environment to 10.2.0.4

>Patch is a bug fix

>collection of bug fixes is called a patch set

>Different types of patches released by oracle are:
1.Interim patch / one-off patch
2.Patch sets
3.Critical patch updates.
4.Patchset updates
5.CRS Hash bundle patches

>All above patches can be installed using Opatch utility except Patchsets.

>Patchsets are installed by invoking runinstaller.

>CRS_HASH bundle patches are patches to fix the bugs in the cluster.

>Clusterware can be patched in two ways
1.Rolling upgrade
2.Non-Rolling upgrade

>Incase of rolling upgrade we will bringdown all the services on then ode that we
wish to install the patch set.This is node by node activity.

>In case of non-rolling upgrade we bring down the entire cluster and install the patch set.

>To know the list of patches installed in CRS_HOME
$ Opatch lsinventory -detail $ORA_CRS_HOME

>To know the list of patches installed in ORACLE_HOME
$ opatch lsinventory -detail $ORACLE_HOME

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